Filter device



//Y /N VENTO/e.

A TTORNEY Jan. 27, 1942. T. J; RoBlNsoN FILTER DEVICE Filed Jan. 1e, 1939 Patented Jan. 27, 1942 UNITED sTArl-:s ,PATENT OFFICEA Thomas J. Robinson, Los Angeles, Calif. Appllcation January 16, 1939,-Serial No.`251,157

Claims. Cl.

This invention relates to a illter device, and

has among its objects the provision of a device havingfew parts, inexpensivein cost of manufacture, which will operate over a long period of time without attention, wherein' the filtering material may be readily changed with minimum of expense, is adaptable for many uses wherever it is necessary to either clean oil or in certain embodiments remove oil from an air line.

The filter device to be described includes a casing of any conventional form and within the casing may be placed waste material, such as cotton waste, cellulose fibre, or that type of `waste which is supplied machine shops and thelike, for

the cleaning of various tools. This waste may be in free form, or in an embodiment of the ,in-

h vention, may be enclosed within 'a suitable-bag.

This constitutes the ltering'material. In addition thereto` and situated above and below the waste material and within the bag are additional filtering members formed of felt. I have found that the felt, together vwithl the waste material accomplishes remarkable results in the filtrationv of oil. In addition to the filtering material mentioned, I also provide a means whereby the rate of movement of liquid through the .filtering material is conveniently regulated to secure the best results for the particular gravity of oil to be filtered.

An object of the present invention is-the pro# vision of a filter device which is capable of working-satisfactorily with oils varying from to 50 gravity. y v

Another: object is the provision of a filter device adapted to properly lter oil or` other material under either high or low ,pressure conditions. f. .Y The present invention is adaptable to the cleaning of oil ofanycharacterand to this end the saidfllter device 4hasits parts kand members so arranged that if the user of said device is unable to obtain a new filter cartridge, still the user may substitute for the cartridge, ordinary cotton waste and thereafter have a device which willillter oil efficiently. Y

With respect to the foregoing object, it is customary to have around repair shops. orv carried in the automobile, bundles of cotton waste and this same waste may be used as the primary illtering material for the oil. Thus, the lter device is an economical one, in that it does not require for its eillclency factory made lter cartridges, nor-specially prepared material for the purpose'of cleaning oil.

Another object is the provision of a flitsende,-l

' is adaptable for high or low pressures.

vice so arranged andconstructed that thev same K In one embodiment of the invention, the arrangement is such that oil pressures from l5 to 75 pounds per square inch may be readily handled and .in then 4second embodiment, oil pressures of 5 to 15 pounds per square inch may be handled.

Another object is the provision of a filter device wherein lint and the like is effectively prevented from in any manner clogging a line through which liquid, such as oil, is passing.

The invention has among its further objects the provision of a filter device which is simple of construction, fool proof in operation, of long life,

efllcient', durable, of few parts, with practically nothing to get out of order, with the filters readily replaceable, and which is generally superior to A devices now on the market adapted to clean oil.

With the above and other objects in view, the invention consists in the novel and useful provision, formation, construction, association, and relative arrangement of parts, members and features, all as shownv in certain embodiments in the accompanying drawing, described generally, and more particularly pointed out in the claims.

In the drawing:

Figure 1 is a fragmentary View in vertical section of the high pressure filter device,

Figure 2 is a fragmentary vertical sectional viewv of the low pressure filter device, and,l

Figure 3 is a fragmentary view and in section taken on the line 3-3 of Figure 1.

Referring now with particularity to the drawing, the filter device shown in Figure 1 is denoted as an entirety by I, wherein 2' is a casing which may be cylindrical in form and provided with a base member 3. lThis casing is open at the top and provided with a rim flange 4, the rim flange in turn formed withthreaded openings 5, of which there may be a space plurality. A cover -orcap 6 acts as a closure for the open end of the casing 2. This cover is of the convex-concavo type merging into `a ring 1, the under surface of base on its inner surface is provided with an anmember 21.

nular shoulder at III.. This shoulder isprovided for the purpose of allowing certain elements of the invention to either lie adjacent the cover or cap or to rest upon the shoulder I0, as see Fig* ure 2. Centrally of the base and axially of the casing, the base is provided with an internal and an external stud Il. This stud is provided withl a central threaded opening and that portion of the stud which is within the connes of the casing is provided'with an inverted conical or tapered wall I2. 'I'his stud is adapted to have connection with the oil line I3 leading from the oil threaded within the stud and it will be noted that this member'has a small opening at I5. Thus, oil from the sump must pass through the orifice member in that form of the invention depicted in Figure l.. v

' pump of say, a motor. An orifice member I4 is The cover 5 is provided with a central enlargement I6 whichl is provided` with a tapped bore I1 to receive an oil line I8 leading to the oil sump in that embodiment ofthe invention where the` present filter device is used in conjunction with a motor. Generally in place of providingvthe oil lines, such as-shown at I3 and I8, in direct threaded connection with the cover and base, t'- tings are utilized. This simplifies the procedure,

as oil lines are usually of soft copper tubing and.

threading of-the same is impractical. An annular depending iiange I9 is positioned 'within the cover.

In the embodiment 'of 4the invention, I provide for placement within the Icasing a primary filter consisting of a `cartridge of waste 2|, such as cellulose fibre, enclosed within a cloth bag 22.l

At ends of the waste are placed felt discs 23 and 24, the cloth bag or envelope being so formed as to annularly overlie the end discs. In constructions of this type, the envelopes may be made substantially cylindrical in form and provided with draw ends. Hence, it is a simple matter to insert a felt disc, tighten the drawstring therevover and iiil the envelope with the cellulose tlbre,

. provided with rim lianges. It will be seen that the rim flange of the member 28 is adapted to receive the upper end of the lprimary iter cartridge Themember 23 includes a perforated disc provided with a rim. flange; this ange nts within'the coniines or the rim ange of the 29 is the secondary illter 25. The fine wire screen lies adjacent the perforated disc or member 23.

Carried on the outer surface ofI the disc or.

member 28 is a member 30. This member is a small cup or disc formed with a rim flange. The discs of .all the members 23 to 30, inclusive, are provided with anaxial bore whereby the members may be held in position ori' assemblage Adapted to be interposed betweenthe disc of the member 21 and a fine wire screen or partially open the periorations therethrough,

3as is self-evident. In the construction shown, the

rim flange 4v is annularly shouldered at 32 and it is to `be observed that the Iange of member 21 rests upon this shoulder. The forming of the groove 8 in ring 1 of the cover 5 provides a iiange 1, which when the flange of member 21 rests on the shoulder 32, engages the top surface of said ange or member 21 and holds the member against movement.

Received within the confines of the annular iiange I 9 is a wire screen 33 and a felt pad 34, and adapted to bear against the inner surface of the disc-or member `3|! and the surface of the felt 34 is a coil spring 35. y

The operation, uses and advantages of that form of the invention just described is as follows: If we assume that oil is entering the device through pipe I3, the same will pass through the orifice and the oriiice will be maintained clean due to the fact that any lint or other material that might otherwise tendto clog the orice may be received within the conical concavity I2 of the stud II. The path of oil movement is as follows: Through the felt disc 23, the primary l filter 20, the felt disc 24, the openings in members 26 and 21, the secondary felt iilter, screen 29, the openings in disc 28 into the space inf lclude'd by the concavity of the top, and the disc The oil will then pass betweenthe ange of member 30 and the concaved surface of the ytop through the space included between the coils 34 and screen 33 into `line I8.

Obviously, the non-concentric position of the perforations of the members 25 and 21, asillus- -trated in Figure 3, will control the velocity of oil through the device. The tortuous path that the oil must use after passing through the secondary filter acts .to assure that all waste materials, and the like, not otherwise trapped by the felt'fllters shall be removed from the oil, and to this end the spring acts as a trap-for any such material. vIn fact, the coils vof the spring withthe slight spacing allowed therebetween, functions as an orifice of the spiral helix type. 1

If we assume that it becomes necessary` to renew' the cartridge, .that is to say, the primary filter, it is a simple matter to remove the screws 3, remove the cap, the assembled members 26, 21, 28 and 30 will lift out, whereupon the cartridge l maybe secured in any manner and pulled from theA casing.-

through the medium o1 a bolt and. securing nut designated generally as 3|. Thus, the members 25 and 21 may be relatively. rotated to either cause alignment of the perforations in the discs If a new cartridge enclosed within a fabric envelope is not obtainable, then cellulose ilbre, or similar material may be packed within the casing. It is'preferable to save the feit discs 23 and 2l, andto place one in the bottom of the casing prior to lling the same with the waste material, and then to place the felt disc 24 over the waste material, whereupon the assembled members, 21 and 30 may again be placed in position and the cap secured tothe` casing. It is hardly ever necessary to renew the accomplished with the use of the felt discs than are accomplished with the device when they are not used. Corrosive elements which may sometimes be present in oil are apparently removed from the oil in the passage through the felt and cotton combination of filters.

In that form of the invention shown in Figure 2, I have provided in a number of instances members of the type used in Figure 1, and whereever possible, like numerals will designate like elements. In vthe form of the invention in Figure 2, I provide what is known as a down-flow lter. The casing is the same as before as is also the cartridge andthe arrangement of the members 2B, 2l and 28, the only difference residing in the provision of an I-bolt in place of that form of bolt shown at 3i, and the elimination of the member 30. I also Provide a further perforated disc 40 having a rim flange 4| adapted enters throughV the cover, passes between the1 openings of the spring, thence through the perforations of the disc 50, the primary filter, the perforations of the member 28, the screen therein, the secondary filter, the perforations-of the members 26 and 2l and outwardly through theoutlet pipe here designated as di. If it is desired toremove the primary filter; the cover may be detached from the casing, and the filter then removed in any ordinary manner. If it is desired to remove the secondary filter assembly, a hook may be inserted within Ythe casing for engagement with the eye 42, whereupon such removal may be accomplished.

It is obvious from the description as given that I have provided a form of filter device which is adaptable to various uses and purposes, and to lines which operate under either high or low pressure. All the parts are easily assembled or disassembled. It does not require a skilled memechanic to clean any part of the device considered as an entirety.

the drill and into the cavity for the purpose of removing the drillings. This air from a compressor usually contains fine vaporized oil and if oil is present in appreciable quantities, the iillings placed in the cavities--of the teeth will not always remain in the cavities. A filter of the low pressure or high pressure type may be utilized in the air line for the purpose of removing oil, dirt and condensation products, thus delivering clean air.

I claim:

1. A filter cartridge comprising a fabric envelope, felted wool discs within said envelope, and` fibrous cellulose interposed between said discs 3. In a device of the character disclosed, a

casing adapted to house; a primary filter, and a secondary filter in contiguous relationship, means interposed between said filters for'regwlating the speed of ow of any liquid to be passed from the primary lter to the secondary lter, and means for removing any foreign material from said secondary liquid after passing through said lter.

4. In a device of the character disclosed, a primary filter, and a secondary filter in contiguous relationship, means interposed between said filters for regulating the speed of flow of any liquid to be passed from the primary lter to the secondary filter, and means for removing any foreign material from said liquid chanic to replace the primary filter, nor a skilled after passing through said secondary filter, said means comprising a closely coiled spring through which said liquid must pass in its ow movement.

5. In a device of the character disclosed, a filter lassembly comprising three perforated discs all provided with rim flanges, two of said discs being in juxta-position-and the other of said discs having the flange thereof resting on a surface of one of the discs, a filter interposed between the last two discs, and means for holding said discs and lter in position of assemblage; and the two discs in juxta-pcsition being relatively turnable to bring the perforations thereof intoregistry or out of registry.

THOMAS J. ROBINSON. 

